Follow path constraint problem
The ball is returning to its original position before the follow path constraint was applied.

Pre-constraint

With follow path constraint active

With follow path constraint at 0 influence

What this means is that that object (the ball or the cube) is now animatable. 

I'd suggest inserting one location &amp; rotation key on the ball before the constraint is turned off (frame 200), then on the same frame that it has been switched off (frame 201), change the location of the ball to where it should be in relation to the animation (as it would have returned to its original position)  and insert a key frame (LocRot).  From there onwards you will be able to hand animate the ball.